Achievement: Solve 10 1d problems

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Solve 10 1d problems

Solve 10 1d problems.

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santoru 1d, Илья Воробьёв 3k, Nicezuka 4d, nikitka228 1k, DieSteinlaus 8k, KAITONG 6k, jago 2k, Kodachi 5k, Michail Nech 1k, Rikikilord3 1k

and 495 others.